You still haven't answered. Why order him out of the car after Hill had already complied by opening the window? He was on the phone explaining the situation to someone when ordered out, and likely seeking guidance.
This cop didnt deserve to be addressed as "sir" at this point. Where was his conflict mitigation training? This type of cop would've only made command after command in an attempt to put Hill in his place. We can see how gleeful the sweaty arse-chaffed cop was while handling a professional athlete on the ground.. Some people out there aren't boot-lickers and have no problem dealing with the consequences of non-compliance when warranted.
Oh, and was this the same cop who waddled over there to cuff Campbell as well?